Tool for cutting holes and washers



(No Model.)

J ADDISON TOOL FOR CUTTING HOLES AND WASHERS.

No. 453,767. Patented June 9, 1891.

UNITED STATES JAMES ADDISON, OF SAN PATENT OFFICE.

FRANCISCO, CALIFORNIA.

TOOL FOR CUTTING HOLES AND WASHERS.

SPECIFICATION forming part of Letters Patent No. 453,767, dated June 9,1891.

Application filed January 28, 1891. Serial No. 379,431. (No model.)

T0 at whom it may concern.-

Be it known that I, JAMES ADDISON, a citizen of Great Britain, residingin the city and county of San Francisco, State of California, haveinvented an Improvement in Tools for Cutting lIoles and Washers; andIhereby declare the following to be a full, clear, and exact descriptionof the same.

My invention relates to the general class of machine-tools designed forthe cutting of holes in metal plates, boiler-heads, tube-holes, shipsplates, and general purposes, and for the making of washers.

My invention consists in the novel construction, arrangement, andcombination of parts hereinafter fully described, and specificallypointed out in the claims.

The object of my invention is to provide a simple and effective tool forthese purposes, capable of rapid and steady work, by reason of avoidingthe necessity of first providing a hole for the tool center to act as aguide, and of taking all the strain and spring of the plate upon saidcenter, thereby removing it from the cutters, as will hereinafter fullyappear.

Referring to the accompanying drawings for a more complete explanationof my inven tion, Figure 1 is a vertical section of my machine-tool.Fig. 2 is a horizontal section on the line a: .r of Fig. 1. Fig. 3 is adetailof the washer I.

A is abar provided with external threads and carrying in its lowerportion the center 13. This center is a removable one, being fitted in asocket in the bar and held therein by a set-screw Z). In the top of thissocket and bearing against the center is a steel thrustbutton a withoil-hole a.

' Fitted about the lower portion of the bar A and adapted to slide upand down thereon is a cross-head C, which is fitted to the bar by meansof the splines or feathers (,WlllOh cause it to rotate with the bar andyet provide for its movement up and down thereon. This cross-headcarries the cutters D, which are fitted in sockets in the ends of thecross-head and are held therein by set-screws and presserblocks (1, asshown.

E is a feed-nut seated upon the bar A, and having its lower end pressingupon the top of the cross-head C. It is also secured to said cross-head,so that it may raise it by means of the washer F, flanged about itslower screws f.

G is a hand-wheel of the feed-nut.

II in Fig. l-represen'ts the plate in which the hole is to be cut, orfrom which the washer is to be cut, and I represents the washer which iscut out.

The operation of the tool is as follows: It is set upon the plate, asshown in Fig. 1. The upper end of the bar Ais put in a drill-press andsaid bar is rotated. This rotation is imparted to all the parts of thetool with the exception of the center B; but by seizing the hand-wheeland momentarily arresting itthe feed-nut will be moved downwardly,thereby pressing downwardly the cross-head and feeding the cutters intothe plate. The bar A and its center 13 remain in the same place,however, continuing their rotation, but not feeding downwardly, as thefeed-nut simply presses down the cross-head which slides on the bar. Thecutters, therefore, cut through the plate, while the center does not.Now to withdraw the cutters the reverse of the operation takes place andthe nut draws up (by means of the washer) the cross-head and out ters.In ordinary tools for cutting holes or cutting out washers it iscustomary to first make a hole completely through the plate. This holeis necessary to receive the center of the tool, which serves as a guidefor the cutters, and as said center feeds downwardly through the plateit must have a clear passage to move with the cutters. This necessity ofmaking the hole first is avoided entirely by the use of my machine.Another disadvantage of the common tool is that all the strain is takenby the cutters, as the center merely serves as a guide in the hole.Consequently all the spring of the plate is received by the cutters,which causes them to jump, and thereby to lose time and to jar themachine. In my machine the strain and the spring of the plate are takenentirely upon the center, thereby relieving the cutters, which have nomore than their legitimate functions to perform namely, of cuttingthrough the plate. Much more rapid and eliective work can thereby beperformed by my machine,

end and secured to the cross-head by the which at the same time issimple in construction and readily operated.

It is not intended that the center 13 shall turn with the bar A. It isfitted freely in the bar, and the latter turns on it, while the centeris stationary. The set -screw 1) simply keeps the center from droppingout. Thus there is no tendency to make a hole in the plate. The oil-holeenables me to keep the bearing of the center in the bar well lubricated,so that it will not turn. The steel thrustbutton takes all the strainand prevents the center from wearing into the body of the bar. It isobvious, though, that as far as the main portion of the tool isconcerned the center B can be any center connected or formed with thebar.

Ilavin g thus described my in vent-ion, what I claim as new, and desireto secure by Letters Patent, is

1. The combination of the rotating threaded bar having a center, thevertically-sliding cross-head mounted upon and rotated by said bar, thecutters of said cross-head, and the feed-screw seated on the threadedbar and bearing on the cross-head, substantially as herein described.

2. The combination of the rotating bar externally threaded and carryingin its lower end a center, the vertically-sliding cross-head mountedupon the lower end of the bar and rotated thereby, the cutters carriedby said cross-head, the feed-nut seated upon the threaded bar andbearing on the cross-head,

and the hand-wheel of said nut, substantially as herein described.

3. The combination of the threaded rotatin g bar having a center in itslower end, the sliding cross-head upon the lower end of the bar, thecutters carried by the crosshead,the feednutseated on the bar and havingthe handwheel, and the washer connecting the lower end of the feed-nutwith the cross-head, substantially as herein described.

4:. The combination of the threaded rotating bar, the separate center B,mounted in the lower endof the bar and upon which the bar turns, thesliding cross-head on the bar, the cutters carried by the cross-head,and the feednut, with hand-wheel mounted on the bar and bearing on thecross-head, substantially as herein described.

5. The combination of the threaded rotating bar having a socket in itslower end, the thrustbutton in the base of the socket with oil-hole, theseparate non-rotary center I in the socket and bearing on thethrust-button, the sliding cross-head on the bar, the cutters carried bythe cross-head, and the feed-nut, with handwheel mounted on the bar andbearing on the cross-h cad, substantially as herein described.

In witness whereof I have hereunto set my hand.

JAMES ADDISON.

\Vitnesses:

S; H. NOURSE, J. A. BAYLEss.

